By Sruthi Shankar and Susan Mathew (Reuters) -European stocks jumped 2.6% on Friday, pushing them into positive territory for the week as investors started to scale back central bank tightening bets, spurring inflows into risky assets. The pan-European STOXX 600 index marked its best session in more than three months. It had hit a fresh 2022 low in the previous session when weaker-than-expected euro zone business activity data weighed on sentiment. The benchmark, which until Thursday was down on the week, posted weekly gains of 2.4% thanks to Friday’s surge, breaking a three-week losing streak…